JP2015186976A - Vehicle body structure of saddle riding type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle body structure of a saddle riding type vehicle facilitating adjusting the rigidity balance of frames even if the vehicle adopts a front suspension.SOLUTION: A pair of right and left down frames (22) each include a lower fastened portion (22d) fastened to an engine (10), extending downward from a head pipe (21) while being wider in a vehicle width direction, and provided on a lower end of the down frame (22); and an upper fastened portion (22b) fastened to the engine (10) and provided in an outer extension portion (22c) offset outward in the vehicle width direction by extending rearward and outward in the vehicle width direction above the lower fastened portion (22d). An upper frame (23) includes a rear fastened portion (23r) fastened to the engine (10) in rear of the upper fastened portions (22b) and the lower fastened portions (22d) of the down frames (22), and a front cushion (40) is disposed between the right and left down frames (22).

Description

  The present invention relates to a vehicle body structure of a saddle-ride type vehicle.

Conventionally, as a vehicle body structure of a saddle-ride type vehicle, for example, a vehicle body structure of a saddle-ride type vehicle as disclosed in Patent Document 1 is known. The vehicle body structure of the saddle-ride type vehicle will be described with reference to the reference. The engine (8a) includes a cylinder (9) at the front and an output (8a) for driving the rear wheel (24) at the rear. )When,
A head pipe (3) that supports the front wheel (1) so as to be steerable, and a pair of left and right down branches that extend downward from the head pipe (3) in front of the engine (8) and support the engine (8) A pair of left and right upper frames (11) for supporting the engine (8) by branching left and right while extending rearward from the head pipe (3) above the frame (10b) and the down frame (10b);
Left and right pivot frames (12b) supporting the pivot (23) of the swing arm (22) supported by the engine (8) above the engine (8) and swingably supporting the rear wheel;
There is known a vehicle body structure of a saddle-ride type vehicle including

Patent No. 4400909

The steering stability performance of saddle-ride type vehicles, especially motorcycles, is the rigidity balance of the frame that supports the engine. The fastening of the frame and engine is an important point.
In the vehicle body structure of the conventional saddle-ride type vehicle described above, the down frame extends linearly without having an offset portion in the vehicle width direction, and is fastened to the engine above and below the straight portion. For this reason, it is difficult to adjust the rigidity of the down frame. In particular, the front suspension is supported so that the upper end of the front cushion is swingably supported by a cross member that connects a pair of left and right upper frames that support the engine by branching left and right while extending backward from the head pipe above the down frame. Is difficult to adjust the rigidity balance of the entire frame due to the difficulty in adjusting the rigidity of the down frame.
The problem to be solved by the present invention is to provide a vehicle body structure for a saddle-ride type vehicle in which the rigidity balance of the frame can be easily adjusted even when the above-described front suspension is employed.

In order to solve the above problems, the vehicle body structure of the saddle-ride type vehicle of the present invention is:
An engine with a cylinder at the front and an output at the rear to drive the rear wheels;
A head pipe that supports the front wheels in a steerable manner, a pair of left and right down frames that extend from the head pipe to the front and the left and right and branch to the left and right to support the engine, and above the down frame, from the head pipe to the rear A main frame having a pair of left and right upper frames that extend and branch to the left and right to support the engine;
Left and right pivot frames that support the pivot of the swing arm that is supported by the engine at the rear of the engine and supports the rear wheels so as to be swingable;
A front cushion whose upper end is swingably supported with respect to a cross member connecting the left and right upper frames;
A vehicle body structure of a saddle-ride type vehicle comprising:
The pair of left and right down frames extends downward from the head pipe while extending in the vehicle width direction, and is provided at the lower end of the lower fastening portion with the engine, and rearward and outward in the vehicle width direction above the lower fastening portion. Provided with an upper fastening portion with the engine provided in the outer extension portion offset to the outside in the vehicle width direction by extending,
The upper frame includes a rear fastening portion that is fastened to the engine behind the upper fastening portion and the lower fastening portion in the down frame,
The front cushion is disposed between the left and right down frames.
According to the vehicle body structure of the saddle-ride type vehicle, the pair of left and right down frames extend in the vehicle width direction by extending rearward and outward in the vehicle width direction above the lower fastening portion with the engine provided at the lower end. Since it has an upper fastening part with the engine provided on the outer extension part offset to the outside, adjusting the offset amount of the outer extension part offset to the outside in the vehicle width direction, etc., adjusts the rigidity of the down frame (Engine support rigidity) becomes easy. Therefore, the front suspension is supported so that the upper end of the front cushion can swing with respect to a cross member that connects the pair of left and right upper frames that support the engine by branching left and right while extending backward from the head pipe above the down frame. Even in the case of adopting, it becomes easy to adjust the rigidity balance of the entire frame by making the rigidity adjustment of the down frame easy.

In the body structure of this saddle-ride type vehicle,
A front wheel suspension device further comprising a fork portion that supports the front wheel, and a suspension link that supports the fork portion in a swingable manner on the main frame and is connected to the main frame by a front cushion;
The down frame may be configured to include a link support portion that supports the suspension link inside the down frame in a narrow portion other than the outer extension portion and above the lower fastening portion.
If comprised in this way, a link can be reduced in size and weight by supporting a link support inside the narrow part of a down frame, and the movement of a front wheel can be made light.

In the body structure of this saddle-ride type vehicle,
Between the pair of left and right down frames, a plate-like cross member that has a through hole through which the front cushion penetrates behind the head pipe and connects the vicinity of the link support portion can be provided. .
With this configuration, the down frame, which is subjected to a large engine load, is connected by a plate-shaped cross member, and the vicinity of the link support portion, which is also subjected to the load of the suspension link, is connected by the same plate-shaped cross member. The frame rigidity can be improved while reducing the weight of the frame.

In the body structure of this saddle-ride type vehicle,
Provide a seating surface consisting of a plane facing forward or backward at the rear of the engine,
The pivot frame is provided with a seating surface that contacts the seating surface,
The seats can be brought into contact with each other, and the engine and the pivot frame can be fastened with fastening bolts that extend in the front-rear direction.
With this configuration, in the frame structure in which the pivot frame is connected to the main frame only via the engine, the accuracy of mutual positioning between the front wheels and the rear wheels is improved by improving the fastening accuracy between the pivot frame and the engine. It can be.

In the body structure of this saddle-ride type vehicle,
The left and right pivot frames may be bifurcated up and down toward the front from the pivot shaft, and the bifurcated portions may be fastened to the upper and lower sides of the engine by fastening bolts.
If comprised in this way, the stress concerning a pivot axis | shaft can be disperse | distributed and supported by fastening a pivot frame to an engine in four places of right and left and up and down.

In the body structure of this saddle-ride type vehicle,
The engine includes a horizontally opposed cylinder part in which the cylinder is arranged in the left-right direction, and an output part arranged behind the cylinder part,
The lower part of the down frame has a U-shape opening rearward in a side view, and an upper fastening part and a lower fastening part are formed at the opening end, and the upper fastening part supports the upper part of the cylinder part, and the lower fastening part Can support the lower part of the cylinder part, and the front part of the cylinder part can be arranged in the opening.
If comprised in this way, engine support can be made favorable by supporting not the front end of a cylinder part but the cylinder center side. In particular, by offsetting the upper fastening portion while approaching the center of gravity of the engine, a good effect can be obtained with a slight offset amount.

The top view of one Embodiment of the vehicle body structure of the saddle-ride type vehicle which concerns on this invention. Similarly side view. 2A and 2B are views showing the main frame 20, in which FIG. 1A is a perspective view, FIG. 2B is a view obliquely viewed from below (in the direction of arrow b in FIG. 1A), and FIG. Perspective view. FIG. 6 is a partial plan view showing a modification of the coupling structure between the engine 10 and the pivot frame 30.

  Embodiments of a vehicle body structure for a saddle-ride type vehicle according to the present invention will be described below with reference to the drawings. In each drawing, the same reference numerals are given to the same or corresponding parts.

  The saddle-ride type vehicle shown in FIGS. 1 and 2 is a motorcycle, and the vehicle body structure includes an engine 10, a main frame 20, a pivot frame 30 (L, R), and a front cushion 40.

  The engine 10 includes a cylinder 11 at a front portion and an output portion 12 that drives a rear wheel WR at a rear portion. The rear wheel WR is driven by the output unit 12 via a drive shaft 52 provided in the swing arm 50. Reference numeral 14 denotes a radiator.

  As shown in FIGS. 1 to 3, the main frame 20 has a head pipe 21 that supports the front wheel WF so that the front wheel WF can be steered, and branches to the left and right while extending downward from the head pipe 21 in front of the engine 10. A pair of left and right down frames 22 (L, R) that support the engine 10 and a pair of left and right upper frames 23 (L, R) that support the engine 10 by branching left and right while extending backward from the head pipe 21 above the down frame 22. R).

As shown in FIGS. 1 and 2, the pivot frame 30 (L, R) is attached to the engine 10 at the rear of the engine 10 and supports the pivot 51 of the swing arm 50 that supports the rear wheel WR in a swingable manner. .
The front cushion 40 is supported such that the upper end 41 can swing with respect to the cross member 24 that connects the left and right upper frames 23 (L, R).

  As shown in FIGS. 1 to 3, the down frame 22 (L, R) extends downward from the head pipe 21 while extending in the vehicle width direction, and is provided at the lower end of the lower fastening portion 22 d with the engine 10. And provided in the outer extension 22c that is offset rearward and outward in the vehicle width direction above the lower fastening portion 22d (the offset amount is indicated by e in FIG. 3B). The upper fastening part 22b with the engine 10 is provided.

The upper frame 23 (L, R) includes a rear fastening portion 23 r fastened to the engine 10 behind the upper fastening portion 22 b and the lower fastening portion 22 c in the down frame 22.
The front cushion 40 is disposed between the left and right down frames 22 (L, R).

  According to the vehicle body structure of such a saddle-ride type vehicle, the pair of left and right down frames 22 (L, R) is rearward and above the lower fastening portion 22d with the engine 10 provided at the lower end and in the vehicle width direction. Since the upper fastening portion 22b with the engine 10 is provided in the outer extending portion 22c offset (e) outward in the vehicle width direction by extending outward, the outer extending portion offset outward in the vehicle width direction By adjusting the offset amount e and the like of 22c (in addition to the offset amount, the shape and thickness of the outer extension 22c), the rigidity adjustment of the down frame 22 (L, R) (engine 10 support rigidity) is facilitated. . Therefore, on the cross member 24 that connects the pair of left and right upper frames 23 (L, R) that support the engine 10 by branching left and right while extending rearward from the head pipe 21 above the down frame 22 (L, R). On the other hand, even when a front suspension in which the front cushion upper end 41 is swingably supported is adopted, it is easy to adjust the rigidity balance of the entire frame by simplifying the rigidity adjustment of the down frame 22 (L, R). Become.

  As shown in FIGS. 1 and 2, the vehicle body structure of the saddle-ride type vehicle includes a fork portion 61 that supports a front wheel WF, a fork portion 61 that is swingably supported on a main frame 20, and a front cushion 40. A front wheel suspension device 60 having a suspension link 62 connected to the frame 20 is provided. A handle (not shown) is fixed to the handle attachment portion 63.

As shown in FIGS. 2 and 3, the down frame 22 (L, R) is located inside the down frame 22 (L, R) above the lower fastening portion 22 d and in a narrow portion other than the outer extension portion 22 c. A link support portion 22f that supports the suspension link 62 is provided.
With this configuration, by supporting the link support inside the narrow portion of the down frame 22 (L, R), the link 62 can be reduced in size and weight, and the movement of the front wheel WF can be lightened.

Between the pair of left and right down frames 22 (L, R), there is a through hole 25h through which the front cushion 40 penetrates behind the head pipe 21, and a plate-like cross member 25 that connects the vicinity of the link support portion 22f. Is provided.
If comprised in this way, the down frame 22 (L, R) to which the load of the engine 10 is large will be connected by the plate-shaped cross member 25, and the vicinity of the link support part 22f to which the load of the suspension link 62 will also be the same plate By connecting with the cross member 25, the frame rigidity can be improved while reducing the weight of the down frame 22 (L, R).

On the rear part of the engine 10, a seating surface 13 made of a plane facing rearward is provided, while a seating surface 33 that abuts on the seating surface 13 is provided on the pivot frame 30. The engine 10 and the pivot frame 30 are fastened by fastening bolts 34 that are brought into contact with each other and directed in the front-rear direction.
With this configuration, in the frame structure in which the pivot frame 30 is connected to the main frame 20 only through the engine 10 as in this embodiment, the fastening accuracy between the pivot frame 30 and the engine 10 is improved. The positional accuracy between the front wheel WF and the rear wheel WR can be improved.
As shown in FIG. 4, the seat surface 13 may be provided forward in the rear portion of the engine 10, and even in that case, the same effect can be obtained.

As shown in FIGS. 1 and 2, the left and right pivot frames 30 (L, R) are bifurcated up and down toward the front from the pivot shaft, and the branch portions 31 and 32 are fastened to the upper and lower sides of the engine 10, respectively. It can be set as the structure fastened with the volt | bolt 34. FIG.
If comprised in this way, the stress concerning the pivot axis | shaft 51 can be disperse | distributed and supported by fastening the pivot frame 30 to the engine 10 in four places on the left and right and up and down.

The engine 10 is a horizontally opposed type in which cylinders 11 (L, R) are arranged in the left-right direction, and the lower part of the down frame 22 (L, R) has a U-shape that opens rearward in a side view. An upper fastening portion 22b and a lower fastening portion 22d are formed at the opening end, the upper fastening portion 22b supports the upper portion of the cylinder portion (11), and the lower fastening portion 22d supports the lower portion of the cylinder portion (11). A front portion 11 f of the cylinder portion is disposed in the interior 26.
If comprised in this way, the support of the engine 10 can be made favorable by supporting not the front end of a cylinder part (11) but the cylinder center side. In particular, by offsetting the upper fastening portion 22b close to the center of gravity of the engine 10, a good effect can be obtained with a slight offset amount.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be appropriately modified within the scope of the gist of the present invention.

  WF: Front wheel, WR: Rear wheel, e: Offset amount, 10: Engine, 11: Cylinder (cylinder part), 12: Output part, 13: Seat surface, 20: Main frame, 21: Head pipe, 22: Down frame 22b: upper fastening portion, 22c: outer extending portion, 22d: lower fastening portion, 22f: link support portion, 23: upper frame, 23r: rear fastening portion, 24: cross member, 25: plate-like cross member, 25h: Through hole, 26: opening, 30: pivot frame, 31, 32: branching portion, 33: seating surface, 34: fastening bolt, 40: front cushion, 41: upper part, 50: swing arm, 51: pivot, 60: Front wheel suspension device, 61: fork, 62: suspension link.

Claims (6)

An engine (10) having a cylinder (11) at the front and an output (12) for driving the rear wheel (WR) at the rear;
A head pipe (21) that supports the front wheel (WF) so as to be steerable, and a pair of left and right that supports the engine (10) by branching left and right while extending downward from the head pipe (21) in front of the engine (10). And a pair of left and right upper frames (23) that support the engine (10) by branching left and right while extending backward from the head pipe (21) above the down frame (22). A mainframe (20) having;
Left and right pivot frames (30) that support the pivot (51) of the swing arm (50) that is supported by the engine (10) behind the engine (10) and that swingably supports the rear wheel (WR);
A front cushion (40) whose upper end is swingably supported with respect to a cross member (24) connecting the left and right upper frames (23);
A vehicle body structure of a saddle-ride type vehicle comprising:
The pair of left and right down frames (22) extends downward from the head pipe (21) while extending in the vehicle width direction, and is provided at a lower end thereof with a lower fastening portion (22d) with the engine (10) and a lower fastening. Upper fastening portion (22b) with engine (10) provided at outer extension portion (22c) that is offset rearward in the vehicle width direction by extending rearwardly and outward in the vehicle width direction above upper portion (22d) And
The upper frame (23) includes a rear fastening portion (23r) fastened to the engine (10) behind the upper fastening portion (22b) and the lower fastening portion (22d) of the down frame (22),
The front cushion (40) is disposed between the left and right down frames (22). In claim 1,
A fork part (61) for supporting the front wheel (WF), and a suspension link for pivotally supporting the fork part (61) on the main frame (20) and connected to the main frame (20) by a front cushion (40) A front wheel suspension (60) having (62),
The down frame (22) is a link support portion (a support portion for supporting the suspension link (62) inside the down frame (22) in a narrow portion above the lower fastening portion (22d) and other than the outer extension portion (22c). 22f), a vehicle body structure for a saddle-ride type vehicle. In claim 2,
Between the pair of left and right down frames (22), there is a through hole (25h) through which the front cushion (40) penetrates behind the head pipe (21), and the vicinity of the link support portion (22f) is connected to each other. A vehicle body structure for a saddle-ride type vehicle, wherein a plate-like cross member (25) is provided. In any one of Claims 1-3,
A seat surface (13) comprising a plane facing forward or rear is provided at the rear of the engine (10),
The pivot surface (30) is provided with a seat surface (33) that contacts the seat surface (13).
A vehicle body structure of a saddle-ride type vehicle characterized in that the engine (10) and the pivot frame (30) are fastened with fastening bolts (34) heading in the front-rear direction by bringing the seating surfaces into contact with each other. In claim 4,
The left and right pivot frames (30) each bifurcate up and down toward the front from the pivot shaft (51), and the bifurcated portions (31, 32) are fastened to the upper and lower sides of the engine (10) by fastening bolts (34), respectively. A vehicle body structure for a saddle-ride type vehicle. In any one of Claims 1-5,
The engine (10) includes a horizontally opposed cylinder part (11) in which the cylinder (11) is arranged in the left-right direction, and an output part (12) arranged behind the cylinder part (11),
The lower part of the down frame (22) has a U-shape that opens rearward (26) in a side view, and an upper fastening part (22b) and a lower fastening part (22d) are formed at the opening end, and the upper fastening part (22b) supports the upper part of the cylinder part (11), the lower fastening part (22d) supports the lower part of the cylinder part (11), and the front part of the cylinder part (11) is arranged in the opening (26). A vehicle body structure for a saddle-ride type vehicle.

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